What you're trying to do is restrict your results in your SQL query. It should look like this:
| dbquery "MYDB" "SELECT text_field FROM my_table WHERE text_field LIKE '%Description%' "
The "LIKE" command searches for any string that contains the string you feed it. The "%" character is a wildcard, so %description% will match any text field that contains the string 'description'.
Also be sure to verify the correct use of SQL quotes within your Splunk search.
Here's a simple manual page on the subject:
http://www.techonthenet.com/sql/like.php
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